linux-kernel - Re: [QUERY] Cold plugged USB device to Inateck PCIE USB card is not detected

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Date:   Thu, 19 Aug 2021 11:09:46 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-usb@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lokesh Vutla <lokeshvutla@...com>
Subject: Re: [QUERY] Cold plugged USB device to Inateck PCIE USB card is not
 detected

On Thu, Aug 19, 2021 at 04:18:12PM +0300, Mathias Nyman wrote:
> On 19.8.2021 10.54, Kishon Vijay Abraham I wrote:
> > Hi All,
> > 
> > I was trying to test PCIe USB card (Inateck) connected to AM64 EVM and
> > J7200 EVM. Inateck uses Renesas uPD720201 USB3 host controller.
> > 
> > So if I connect USB pendrive and then boot the board (cold plug), I
> > don't see the pendrive getting detected. But if I remove and plug it
> > again, it gets detected.
> > 
> > For the cold plug case, I see this message
> > 	"usb usb1-port3: couldn't allocate usb_device"
> > 
> > It actually fails in
> > xhci_alloc_dev()->xhci_queue_slot_control()->queue_command()->XHCI_STATE_HALTED
> > 
> > I'm not familiar with xhci but it looks like port event is invoked
> > before the controller is fully initialized (?).
> 
> Maybe this controller is capable of generating interrupts before it's running?

Mathias and Kishon:

Note that this issue has also been reported in Bugzilla:

	https://bugzilla.kernel.org/show_bug.cgi?id=214021

Alan Stern